RX 55 / 59

rotor grinding

machine concept

The RX series machines are designed exclusively for discontinuous profile grinding. A special highlight is the extremely high stock removal capability of the rotor grinding machine, which is required for efficient grinding of rotor profiles, and which is made possible by the drive power.

The rotor grinding machines of the RX series are employed for pre-finish and finish grinding of pre-profiled steel and cast-iron profiles. The part spectrum covers screw-type compressors rotors, rotary pistons, screw-type pump spindles etc.

The RX series uses only non-dressable CBN tools. The directly driven grinding spindle of the RX machine can hold two grinding wheels whereas the tools are sequentially moved into the grinding position. This allows the pre-finish and finish grinding in one set-up.

Due to the innovative drive concept on the tool side, the rotor grinding machines of the RX series reach up to 46 kW in the speed range of 2,000 to 8,000 min-1. Especially for roughing this high performance is resulting in highest stock removal rates and is shortening machining times considerably. In combination with an optimally adapted tool technology, a highly productive and efficient working process will be guaranteed.

control and software

The control system Siemens Sinumerik 840D sl is equipped with an operator-friendly menu-driven user interface, developed by KAPP NILES to match the specific machining requirements. The following options are available, including

  • alignment of pre-machined profiles using a non-contact sensor in reference to one or all gaps
  • precise alignment of pre-machined profiles with a probe
  • runout inspection on bearing journal at tailstock side
  • adaptive control of the feed axis to prevent overloading the grinding process due to excessive stock removal amounts

measuring system

The optional measuring device allows to measure and to evaluate profile parameters against specifications. This functionality is mainly used to optimise the set-up processes in the machine, particularly in order to eliminate non-operational periods due to external measuring processes as far as possible. Alternatively, random samples can be tested during processing.


Several loading systems can be integrated in the machine installation. Depending on the task definition, the type and volume of the workpiece loading as well as additional functions embedded in the automatic sequence can be freely defined.

  max. profile
OD [mm]
max. workpiece length [mm] max. profile
length [mm]
max. profile
width [mm]
max. profile
height [mm]
RX 55 320 1,200 550 180 80
RX 59 320 1,650 850 180 80